Tube:A thin layer of secretion encrusted with a very thick layer of mud.

Colour:In life rust-red. In alcohol pale yellow.

Habitat:On sand, mud or mixed bottoms; 50-800 m.

Distribution:West and South Greenland, Labrador, North American Atlantic, western Ireland, Novaya Zemlya, Canadian and Alaskan Arctic, Bering Sea, Sea of Okhotsk, Japan Sea. Iceland, the Faeroes, Northeast Svalbard, Norwegian coast from Trondelag to the Russian border, northern and southwestern North Sea.